What quantum mechanics tells us, I believe, is surprising to say the least. It tells us that the basic components of objects — the particles, electrons, quarks etc. — cannot be thought of as ‘self-existent’. The reality that they, and hence all objects, are components of is merely ‘empirical reality’.
“This reality is something that, while not a purely mind-made construct as radical idealism would have it, can be but the picture our mind forces us to form of ... Of what ? The only answer I am able to provide is that underlying this empirical reality is a mysterious, non-conceptualisable ‘ultimate reality’, not embedded in space and (presumably) not in time either.”
— Quantum physicist Bernard d’Espagnat, in the London Guardian